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Old 08-11-2012, 02:28 AM   #1
scoobymatt93
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Member#: 254115
Join Date: Aug 2010
Chapter/Region: Tri-State
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2009 Impreza 2.5i
Dark Grey Metallic

Default CEL after UEL header install, any thoughts?

I just installed the Rallisport UEL headers on my scooby and I pulled a P0031 first thing starting the car. I'm going to look at the wires tomorrow and see how all of that looks, but where would be the next step? I'm not really scooby savvy when it comes to really working under the hood, so I don't know where to begin Thanks guys!
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Old 08-11-2012, 03:07 AM   #2
Bababou
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Newport blue

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Quick google search has tons of sugestions. Im borded at work so here is some stuff I found. The o2 sensors can be finicky and delicate.
http://engine-codes.com/p0031_subaru.html
1. Make sure the front o2 is properly tight.
2. Did the o2 get damaged in the swap. Ex. dropped, bumped, something spilled / sprayed on it. While installed in either header was the header dropped or bumped.
3. Reset the ECU after checking for proper fitment. Warm the car up, turn off, pull the ECU fuse step on the break for 5 seconds. Put the fuse back and fire up the car let it run for about 10 mins while it relearns. This is when you cross your fingers and rub any luck charms hoping you dont have to buy a new o2 sensor.
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Old 08-11-2012, 03:32 AM   #3
Bababou
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Newport blue

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Possible more important question... How did the header sound?
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Old 08-11-2012, 03:33 AM   #4
klaus_b2
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if you cant get it off, contact the seller of the headers and see if they have had the same problems...probably know how to fix it
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Old 08-11-2012, 03:43 AM   #5
Bababou
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When I read through the Rallisport header post the only other reports of CELs I remember were due to cold days and they went away. Matt 1 other thing to check is make sure the plug for the o2 is back in tight and nothing got on the connectors, if you unplugged them that is.
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Old 08-11-2012, 02:17 PM   #6
scoobymatt93
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Dark Grey Metallic

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Quote:
Originally Posted by Bababou View Post
Possible more important question... How did the header sound?
They sound EXCELLENT. I'll be posting a high quality video by the end of the weekend!

Quote:
Originally Posted by Bababou View Post
Quick google search has tons of sugestions. Im borded at work so here is some stuff I found. The o2 sensors can be finicky and delicate.
http://engine-codes.com/p0031_subaru.html
1. Make sure the front o2 is properly tight.
2. Did the o2 get damaged in the swap. Ex. dropped, bumped, something spilled / sprayed on it. While installed in either header was the header dropped or bumped.
3. Reset the ECU after checking for proper fitment. Warm the car up, turn off, pull the ECU fuse step on the break for 5 seconds. Put the fuse back and fire up the car let it run for about 10 mins while it relearns. This is when you cross your fingers and rub any luck charms hoping you dont have to buy a new o2 sensor.
Awesome, thanks for the info. I'll give that a try and see what happens.

Quote:
Originally Posted by klaus_b2 View Post
if you cant get it off, contact the seller of the headers and see if they have had the same problems...probably know how to fix it
I've already talked to Mike over at Rallisport.He's been helpful thus far and has given me some tips.

Quote:
Originally Posted by Bababou View Post
When I read through the Rallisport header post the only other reports of CELs I remember were due to cold days and they went away. Matt 1 other thing to check is make sure the plug for the o2 is back in tight and nothing got on the connectors, if you unplugged them that is.
Yeah I hoped it would go away, but between the CEL and my town MPG of 14-16... There is definitely something wrong. I'm going to take a look at it and HOPE I don't need a new O2 sensor...
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Old 08-11-2012, 02:24 PM   #7
Imprezzedwitsubies
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Sometimes when installing a header on ANY car, you actually need a spacer where the o2 sensor is to pull it out of the exhaust flow a little bit. The increased exhaust flow sometimes fools the sensor into thinking that there is a problem.
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Old 08-11-2012, 09:40 PM   #8
GrundleJuice
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Quote:
Originally Posted by Imprezzedwitsubies
Sometimes when installing a header on ANY car, you actually need a spacer where the o2 sensor is to pull it out of the exhaust flow a little bit. The increased exhaust flow sometimes fools the sensor into thinking that there is a problem.
Do not install a spacer on any 05+ n/a impreza. It will guarantee poor fuel control
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Old 08-12-2012, 02:29 AM   #9
Bababou
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2010 2.5i Impreza
Newport blue

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Have you had a chance to check into the issue yet?
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Old 08-13-2012, 11:32 AM   #10
suex
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o6 impreza rs
silver

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Did you put the O2 sensors in the correct order?.. A spacer won't make the code go away either... The wires are kinda finicky on a sensor you may have cracked one(happened to me)... Good luck.
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